Method and apparatus for manufacturing composite product

Abstract

An apparatus manufactures a composite product having a first molding product and a second molding product. The second molding product is supported by the first molding product through a supporting member. The apparatus includes a molding die, and an injection molding machine supplying a mold material into the molding die. The molding die includes a first cavity for molding the first molding product, a second cavity for molding the second molding product, a first passage for introducing a molding material into the first cavity from the injection molding machine, and a second passage for introducing a molding material in the first cavity into the second cavity.

1. A method for manufacturing a composite product having a first molded part and a second molded part, the second molded part being supported by the first molded part through a supporting shaft, the method comprising:
 providing a molding die having a first cavity for molding the first molded part and an independently formed second cavity for molding the second molded part; 
 disposing a first portion of the supporting shaft in the first cavity and a second portion of the supporting shaft in the second cavity; 
 introducing a molding material from an injection-molding machine into the first cavity through plural first passages connecting the injection-molding machine with the first cavity; 
 introducing the molding material in the first cavity into the second cavity through plural second passages connecting the first cavity with the second cavity at a position separate and apart from said first portion of the supporting shaft; 
 solidifying the molding material introduced into the first cavity and the second cavity; and 
 removing solidified first and second molded parts from the first and the second cavities, wherein 
 the second molded part is disposed within the first molded part which has a cylindrical shape, 
 the first cavity includes a cylindrical body molding portion, 
 the second cavity is provided on a center axis of the cylindrical body molding portion, 
 the molding material is introduced into the first cavity through plural first passages which are symmetrically formed with respect to a center axis of the cylindrical body molding portion, and 
 the molding material in the first cavity is introduced into the second cavity through plural second passages which are symmetrically formed with respect to a center axis of the supporting shaft. 
 
     
     
       2. The method for manufacturing a composite product according to  claim 1 , wherein:
 the first molded part is a throttle body of a throttle apparatus, the second molded part is a throttle valve, and the supporting shaft is a throttle shaft. 
 
     
     
       3. A method for manufacturing a composite product having a first molded part and a second molded part, the second molded part being supported by the first molded part through a supporting member, the method comprising:
 providing a molding die having a first cavity for molding the first molded part and an independently formed second cavity for molding the second molded part; 
 disposing a first portion of the supporting shaft in the first cavity and a second portion of the supporting shaft in the second cavity; 
 introducing a molding material from an injection-molding machine into the second cavity through plural first passages connecting the injection-molding machine with the second cavity; 
 introducing the molding material in the second cavity into the first cavity through plural second passages connecting the second cavity with the first cavity at positions separate and apart from said first portion of the supporting shaft; 
 solidifying the molding material introduced into the first cavity and the second cavity; and 
 removing solidified first and second molded parts from the first and the second cavities, wherein 
 the second molded part is disposed within the first molded part which has a cylindrical shape, 
 the first cavity includes a cylindrical body molding portion, 
 the second cavity is provided on a center axis of the cylindrical body molding portion, 
 the molding material is introduced into the second cavity through plural first passages which are symmetrically formed with respect to a center axis of the supporting shaft, and 
 the molding material in the second cavity is introduced into the first cavity through plural first passages which are symmetrically formed with respect to a center axis of the cylindrical body portion. 
 
     
     
       4. The method for manufacturing a composite product according to  claim 3  wherein:
 the first molded part is a throttle body of a throttle apparatus, the second molded part is a throttle valve, and the supporting shaft is a throttle shaft.